1 /* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
2 ** All rights reserved.
4 ** Authors: Martin Trapp, Christian Schaefer &
8 @@@@@@@ Improve documentation: distinguish fields that are
9 set by the frontend and contain knowledge specified by the source
10 program from fields containing information derived by analysis/optimization
14 ** type.h: datastructures to hold type information.
16 ** This module supplies datastructures to represent all types
17 ** known in the compiled program. This includes types specified
18 ** in the program as well as types defined by the language. In the
19 ** view of the intermediate representation there is no difference
20 ** between these types.
21 ** Types are different from the modes defined in irmode: Types are
22 ** on the level of the programming language, modes at the level of
23 ** the target processor.
26 ** General datastructure
27 ** =====================
29 ** Firm distinguishes several different type constructs. These are
30 ** implemented as structs. A union of the individual structs constructs
31 ** the firm node "type".
33 ** All type constructs have the following fields:
35 ** kind A firm_kind tag containing k_type_class. This is useful
36 ** for dynamically checking the sort of a type. Automatically
39 ** name An identifier specifying the type name. Set by the frontend.
41 ** visit A counter for walks of the type information.
44 ** General functionality
45 ** =====================
47 ** is_type(t) Returns true if t is a type node, else false.
53 ** Type_class represents class types. A list of fields and
54 ** methods is associated with a class. Further a class can
55 ** inherit from and bequest to other classes.
60 ** **member All entities belonging to this class. This are methodes
61 ** which have type_method or fields that can have any of the
62 ** following types: k_type_class, k_type_strct, k_type_union,
63 ** k_type_array, k_type_enumeration, k_type_pointer, k_type_primitive.
65 ** **subtypes A list of direct subclasses.
67 ** **supertypes A list of direct superclasses.
73 ** Type_strct represents aggregate types that consist of a list
79 ** **member All entities belonging to this class. This are the fields
80 ** that can have any of the following types: k_type_class,
81 ** k_type_strct, k_type_union, k_type_array, k_type_enumeration,
82 ** k_type_pointer, k_type_primitive.
87 ** Type_method represents method, function and procedure types.
92 ** arity Number of parameters to the procedure. @@@ better n_params
93 ** A procedure in FIRM has only call by value parameters.
95 ** **param_type A list with the types of parameters. This list is ordered.
96 ** The nth type in this list corresponds to the nth element
97 ** in the parameter tuple that is a result of the start node.
98 ** (See ircons.h for more information.)
100 ** n_res The number of results of the method. In general, procedures
101 ** have zero results, functions one.
103 ** **res_type A list with the types of parameters. This list is ordered.
104 ** The nth type in this list corresponds to the nth input to
105 ** Return nodes. (See ircons.h for more information.)
111 ** Type_union represents union types.
116 ** **unioned_type A list of unioned types.
122 ** Type_array represents rectangular multi dimensional arrays.
127 ** n_dimensions Number of array dimensions.
129 ** *lower_bound Lower bounds of dimensions. Mostly all 0.
131 ** *upper_bound Upper bounds or dimensions.
133 ** *element_type The type of the array elements.
139 ** Enumeration types. These need not necessarily be represented explicitly
140 ** by Firm types, as the frontend can lower them to integer constants as
141 ** well. For debugging purposes or similar tasks this information is useful.
146 ** **enum The target values representing the constants used to
147 ** represent individual enumerations.
149 ** **enum_name Idents containing the source program name of the enumeration
160 ** *mode The mode used to implement a pointer. @@@ So far this field
161 ** is constant and set to mode_P. Maybe we will move this
162 ** to a global constant (irprog), or are there processors
163 ** that require a set of different pointer modes?
165 ** *points_to The type of the entity this pointer points to.
170 ** Primitive types are types that represent indivisible data values that
171 ** map directly to modes.
176 ** mode The mode to be used for this type.
187 /* for recursive type definiton */
188 typedef union type type;
190 /* visited flag to traverse the type information */
191 extern unsigned long type_visited;
193 /*******************************************************************/
195 /*******************************************************************/
200 /** needs list with it's entities -- does it really??
201 Entities can be added during their creation.
202 entities **member; **/
203 /** to represent inheritance
204 type_class **subtypes; * direct subtypes *
205 type_class **supertypes; * direct supertypes *
207 unsigned long visit; /* visited counter for walks of the type information */
211 /* create a new type_class */
212 type_class *new_type_class (ident *name);
214 /* manipulate fields of type_class */
215 char *get_class_name (type_class *clss);
216 ident *get_class_ident (type_class *clss);
218 void set_class_name (type_class *clss, char *name);
219 void set_class_ident (type_class *clss, ident* ident);
222 /* get_class_entity_arr
224 get_class_entity(class, pos)
225 set_class_entity(class, pos, entity)
231 /*******************************************************************/
233 /*******************************************************************/
238 /** needs list with it's entities -- does it really??
239 Entities can be added during their creation.
242 unsigned long visit; /* visited counter for walks of the type information */
246 /* create a new type_strct */
247 type_strct *new_type_strct (ident *name);
249 /* manipulate fields of type_strct */
250 char *get_strct_name (type_strct *strct);
251 ident *get_strct_ident (type_strct *strct);
253 void set_strct_name (type_strct *strct, char *name);
254 void set_strct_ident (type_strct *strct, ident* ident);
258 /*******************************************************************/
260 /*******************************************************************/
264 ident *name; /* Name of the method type. Usually method
265 types are not explicitly named (but the entity). */
266 int arity; /* number of parameters, better n_params */
267 type **param_type; /* code generation needs this information.
268 Should it be generated by the frontend,
269 or does this impose unnecessary work for
270 optimizations that change the parameters of
272 int n_res; /* number of results */
273 type **res_type; /* array with result types */
274 unsigned long visit; /* visited counter for walks of the type information */
277 /* create a new type_method */
278 type_method *new_type_method (ident *name, int arity, int n_res);
280 /* manipulate fields of type_method */
281 char *get_method_name (type_method *method);
282 ident *get_method_ident (type_method *method);
284 void set_method_name (type_method *method, char *name);
285 void set_method_ident (type_method *method, ident* ident); */
287 inline int get_method_arity (type_method *method);
288 inline void set_method_arity (type_method *method, int arity);
289 inline type *get_method_param_type(type_method *method, int pos);
290 inline void set_method_param_type(type_method *method, int pos, type* type);
292 inline int get_method_n_res (type_method *method);
293 inline void set_method_n_res (type_method *method, int n_res);
294 inline type *get_method_res_type(type_method *method, int pos);
295 inline void set_method_res_type(type_method *method, int pos, type* type);
298 /*******************************************************************/
300 /*******************************************************************/
304 ident *name; /* do I need a name? */
306 /* type **unioned_type; ... or something like that? */
307 unsigned long visit; /* visited counter for walks of the type information */
310 /* create a new type_union -- set unioned types by hand. */
311 type_union *new_type_union (ident *name, int n_types);
313 /* manipulate fields of type_union */
314 char *get_union_name (type_union *uni);
315 ident *get_union_ident (type_union *uni);
317 void set_union_name (type_union *union, char *name);
318 void set_union_ident (type_union *union, ident* ident);
321 int get_union_n_types (type_union *union);
322 void set_union_n_types (type_union *union, int n);
323 type *get_union_unioned_type (type_union *union, int pos);
324 void set_union_unioned_type (type_union *union, int pos, type *type);
327 /*******************************************************************/
329 /*******************************************************************/
331 /* multidimensional, polyhedric arrays */
339 unsigned long visit; /* visited counter for walks of the type information */
342 /* create a new type array -- set dimension sizes independently */
343 type_array *new_type_array (ident *name, int n_dimensions);
345 /* manipulate fields of type_array */
346 char *get_array_name (type_array *array);
347 ident *get_array_ident (type_array *array);
349 void set_array_name (type_array *array, char *name);
350 void set_array_ident (type_array *array, ident* ident);
352 void set_array_n_dimensions (type_array *array, int n);
353 int get_array_n_dimensions (type_array *array);
355 void set_array_bounds (type_array *array, int dimension, int lower_bound,
357 void set_array_lower_bound (type_array *array, int dimension, int lower_bound);
358 void set_array_upper_bound (type_array *array, int dimension, int upper_bound);
359 int get_array_lower_bound (type_array *array, int dimension);
360 int get_array_upper_bound (type_array *array, int dimension);
362 void set_array_element_type (type_array *array, type *type);
363 type *get_array_element_type (type_array *array);
365 /*******************************************************************/
366 /** TYPE_ENUMERATION **/
367 /*******************************************************************/
368 /** Enums are needed to keep debugging information. They can as well
369 be lowered to integers. **/
375 tarval **enum * Contains all constant nodes that represent a member
376 of the enum -- enumerators. */
378 ident **enum_name * Contains the names of the enum fields as specified by
379 the source program */
380 /* is ir_node the propper array member? */
381 unsigned long visit; /* visited counter for walks of the type information */
384 /* create a new type enumeration -- set the enumerators independently */
385 type_enumeration *new_type_enumeration (ident *name /* , int n_enums */);
387 /* manipulate fields of type_enumeration */
388 char *get_enumeration_name (type_enumeration *enumeration);
389 ident *get_enumeration_ident (type_enumeration *enumeration);
391 void set_enumeration_name (type_enumeration *enumeration, char *name);
392 void set_enumeration_ident (type_enumeration *enumeration, ident* ident);
395 void set_enumeration_n_enums (type_enumeration *enumeration, int n);
396 int *get_enumeration_n_enums (type_enumeration *enumeration);
397 void set_enumeration_enum (type_enumeration *enumeration, int pos,
399 ir_node *get_enumeration_enum (type_enumeration *enumeration, int pos);
402 /*******************************************************************/
404 /*******************************************************************/
409 /* ir_mode *mode; * The mode to be used for this type.
410 Not here as there might be several pointer types?
411 A method get_pointer_mode should read a unique,
414 unsigned long visit; /* visited counter for walks of the type information */
417 /* create a new type pointer */
418 type_pointer *new_type_pointer (ident *name, type *points_to);
420 /* manipulate fields of type_pointer */
421 char *get_pointer_name (type_pointer *pointer);
422 ident *get_pointer_ident (type_pointer *pointer);
424 void set_pointer_name (type_pointer *pointer, char *name);
425 void set_pointer_ident (type_pointer *pointer, ident* ident);
427 void set_pointer_points_to_type (type_pointer *pointer, type *type);
428 type *get_pointer_points_to_type (type_pointer *pointer);
430 /*******************************************************************/
431 /** TYPE_PRIMITIVE **/
432 /*******************************************************************/
434 /* primitive, language-defined types */
435 /* What is the type of an entity if it is atomic? Are alle basic data
436 types classses in Sather? Else this is needed. */
440 ir_mode *mode; /* The mode to be used for this type */
441 unsigned long visit; /* visited counter for walks of the type information */
444 /* create a new type primitive */
445 type_primitive *new_type_primitive (ident *name, ir_mode *mode);
447 /* manipulate fields of type_primitive */
448 char *get_primitive_name (type_primitive *primitive);
449 ident *get_primitive_ident (type_primitive *primitive);
451 void set_primitive_name (type_primitive *primitive, char *name);
452 void set_primitive_ident (type_primitive *primitive, ident* ident);
454 ir_mode *get_primitive_mode (type_primitive *primitive);
455 void set_primitive_mode (type_primitive *primitive, ir_mode *mode);
460 /*******************************************************************/
461 /** To manage all different types the same **/
462 /*******************************************************************/
470 type_union uni; /* union is keyword */
471 type_enumeration enumeration;
472 type_pointer pointer;
473 type_primitive primitive;
476 int is_type(void *thing);
481 # endif /* _TYPE_H_ */